RFC 7489 Obsoleted: Receivers MUST Now Downgrade to Quarantine by Default (rfc-editor.org)

• RFC 7489 (DMARC) declared obsolete by the IETF.
• New standard mandates quarantine as default handling for DMARC failures.
• Reject action no longer permitted as default; only quarantine or none.

"The IETF has obsoleted RFC 7489 (DMARC), replacing it with a new standard that mandates email receivers must apply quarantine (not reject) by default for failing messages. This shifts policy from optional rejection to mandatory quarantine, affecting global email infrastructure."